Good for snow. Not going to work well on ice…. I haven’t found a review which compares ice traction/braking… not even sure how well a winter tyre would, I’d think you’d need studded tyres if it’s really polished!
They only compare snow performance. Which is fine, if you know this. If you get a fresh dumping or if it’s slushy the performance is great.
The issue in the UK is the poorly cleared side roads as you’ve found out becoming compacted and then lots of freeze/thaw turning into sheet ice over several days.
Edit, you say wouldn’t grip very well (but they did have grip), and still maintained control. Want to go and repeat the test with summer tyres and report back?
Yeah - all seasons are usually loads better than touring/summer tyres on snow but only a bit better on ice - if you hit proper ice (and in some cases slush) you are going to need decent winter tyres to stay composed.